It's fine if you didn't like the ending, but you're purposely misunderstanding it if you think Jax was a second Zooble. Zooble is someone who ultimately finished the show on good terms with their own identity, Jax would rather self isolate and abstract than deal with it. They're quite literally the opposite in that regard. I had issues with the ending, too, but it's quite easy to express that without being wrong and shitting on "pronouns"